package hjkj.util;


import hjkj.bean.Header;

public class CRC8
{
	//static int[] intData;
	
	public static byte CRC(byte[] data)
	{
		int crc = 0;
		int index = 0;
		// System.out.println("data.leng:" + data.length);
		for (int i = 0; i < data.length; i++) {
			index = crc ^ (data[i] & 0xff);
//			System.out.println(crc + "..." + data[i] + "..." + index);
			crc = crc8table[index];
		}
		System.out.println(crc + ", " + (byte)crc);
		return (byte)crc;
	}

//	public int get
	public static void main(String[] args)
	{
//		System.out.println((byte)crc8table[10] ^ crc8table[44]);
//		System.out.println((byte)254);

		Header header = new Header();
//		header.dest = 1;
//		header.cmd = CMDType.HANDSHAKE_TYPE;
//		header.length = 0x0D;
//		header.verFlag = DataManage.shortToBytes((short)0x01);
		//给握手信息添加crc校验
		byte[] handMessage = new byte[13];
		System.arraycopy(header.getBytes(), 0, handMessage, 0, 12);
		handMessage[12] = CRC8.CRC(header.getBytes());
		System.out.println("握手校验：" + handMessage[12]);



	}

	public static final int[] crc8table = {
				0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
				157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
				35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
				190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
				70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
				219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
				101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
				248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
				140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
				17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
				175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
				50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
				202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
				87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
				233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
				116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53};
}
